ATOMIC MODELS

ATOMIC MODELS
DEMOCRIT ATOMIC MODEL
FEATURES
1) Atoms are eternal, indivisible, homogeneous,
incompressible and invisible.
2) Atoms differ only in shape and size,
but not for internal qualities.
3) The properties of matter vary according to the
grouping of atoms.
450 A.C
DALTON ATOMIC MODEL
1803 D.C
FEATURES
1) Elements are made up of atoms
2) The atoms of the same element are all the same
each.
3) Compounds are formed by the union of atoms of
different elements, combined in a simple and
constant forming well-defined entities called
molecules.
LEWIS ATOMIC MODEL
FEATURES
1. A graphical representation showing the pairs of
electrons in dashes or bond points between atoms
of a molecule and the lone electron pairs that
may exist.
2. This representation is used to know the amount of
valence electrons of an element that interact with
others or between their own species, forming links either
single, double, or triple which are found
closely related to molecular geometry.
3. They are simple two-dimensional representations of the
connectivity of atoms in molecules; as well as
the position of the bonding and non-bonding electrons.
1902 d.C.
ATOMIC MODEL OF
THOMSON
1904 d.C
FEATURES
1. Matter is electrically neutral so, in addition
contain electrons, there must be particles with
positive charges.
2. There was a source of positive charge that neutralized the
negative charge that electrons had.
3. The atom has only a neutral charge.
4.The positive charge was evenly distributed
in the atom.
ATOMIC MODEL OF
RUTHERFORD
FEATURES
1) The atom has a central nucleus in which it is
concentrated positive charge, and almost all of its mass.
2) In the outer zone (bark) is the load
negative that is made up of electrons.
3) The nucleus contains protons.
4) The electrons revolve around the nucleus and are
separated from it by a great distance.
1911 d.C.
MODELO ATÓMICO DE BOHR
1913 d.C.
FEATURES
1) Atoms that have the same number of electrons
of valence and that have different numbers, have
similar characteristics.
2) Atoms have too small a nucleus and
dense containing subatomic particles.
3) Electrons are in different orbits
around the core.
4) Atoms are electrically neutral, but if they have
negatively charged electrons must contain other
positively charged particles (protons).
MODELO ATÓMICO DE
SOMMERFELD
FEATURES
1.Use Coulomb's Law to state that if a
electron is subjected to a force inversely
proportional to the square of the distance, the path
described should be elliptical and not strictly circular.
2.conclude that the energy difference between the
electrons (even though these were in the same
energy level) was due to the existence of sub-levels
energy within each level.
3. It was based on Einstein's theory of relativity to
give electrons a different treatment, and evaluate their
behavior depending on the speeds reached
by said fundamental particles.
1916 d.C
MODELO ATÓMICO DE
SCHRÖDINGER
1926 d.C.
FEATURES
1.Describe the motion of electrons as waves
stationary.
2.Electrons are constantly moving, that is, not
they have a fixed or definite position within the atom.
3.This model does not predict the location of the electron, nor
describes the path it takes within the atom. Alone
establishes a probability zone to locate the
electron.
4.These probability areas are called orbitals
atomic. The orbitals describe a motion of
translation around the nucleus of the atom.
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